The Dallas killings took place during a street protest over police violence. Videos showing two African-American men shot by police earlier this week in Louisiana and Minnesota spurred protests and debate over police use of force.

Here's a look at some of the planned rallies:

Atlanta

The Atlanta chapter of the NAACP has organized a "march for justice" at 6 p.m. Friday at Centennial Olympic Park, starting at the nearby National Center for Civil and Human Rights museum.